Deformation and stress distribution during the production of stainless steel pipe elbows

2024-08-27

Deformation characteristics of stainless steel pipe elbows during bending
The deformation of stainless steel thin-walled elbows during bending is mainly manifested in the following aspects:

First, the inner and outer diameter deformations produced during the bending process are small. Due to its thin-walled structure, the inner and outer diameters of stainless steel thin-walled elbows will change during the bending process. It has been verified in practice that the inner diameter deformation rate of stainless steel thin-walled elbows is usually controlled within 2%, and the outer diameter deformation rate is usually controlled within 4%.

Secondly, the cross-sectional shape changes during the bending process are small. Stainless steel thin-walled elbows are subjected to tensile and compressive forces during the bending process, causing their cross-sectional shape to change. However, due to the excellent performance of its material, the cross-sectional shape of stainless steel thin-walled elbows changes little and can maintain a good fluid channel.

Stress distribution during the bending process of stainless steel pipe elbows
During the bending process, the pipe wall of the stainless steel thin-walled elbow is subjected to stress, and its stress distribution characteristics are as follows:

First, the stress concentration area generated during the bending process is at a distance of 1.5 times the bending radius. The larger the bending radius of the stainless steel thin-wall elbow, the smaller the distance between the stress concentration area and the bending radius.

Secondly, the stress distribution during the bending process is symmetrical. During the bending process, the stress distribution of the inner and outer diameters of the stainless steel thin-wall elbow is symmetrical. This symmetrical feature can ensure the stability of the pipeline system and the smooth flow of the fluid channel.

The stress change rate generated during the bending process is large. During the bending process, the stainless steel thin-wall elbow has a large stress change rate due to the tensile and compressive forces. In order to ensure the safe operation of the pipeline system, the stress during the bending process must be fully calculated and controlled.

1. The center positions of the two ends are different

The center points of the two ends of the stainless steel eccentric reducer are not on the same axis.

The center points of the two ends of the stainless steel concentric reducer are on the same axis.

2. Different operating environments

One side of the stainless steel eccentric reducer is flat. This design facilitates exhaust or liquid drainage and facilitates maintenance. Therefore, it is generally used for horizontal liquid pipelines.

The center of the stainless steel concentric reducer is on a line, which is conducive to fluid flow and has less interference with the flow pattern of the fluid during diameter reduction. Therefore, it is generally used for diameter reduction of gas or vertical liquid pipelines.

3. Different installation methods

Stainless steel eccentric reducers are characterized by simple structure, easy manufacturing and use, and can meet a variety of pipeline connection needs. Its application scenarios mainly include:

Horizontal pipe connection: Since the center points of the two ends of the stainless steel eccentric reducer are not on the same horizontal line, it is suitable for the connection of horizontal pipes, especially when the pipe diameter needs to be changed.

Pump inlet and regulating valve installation: The top flat installation and bottom flat installation of the stainless steel eccentric reducer are suitable for the installation of the pump inlet and regulating valve respectively, which is beneficial to exhaust and discharge.

Stainless steel concentric reducers are characterized by less interference to fluid flow and are suitable for reducing the diameter of gas or vertical liquid pipelines. Its application scenarios mainly include:

Gas or vertical liquid pipeline connection: Since the center of the two ends of the stainless steel concentric reducer is on the same axis, it is suitable for the connection of gas or vertical liquid pipelines, especially where diameter reduction is required.

Ensure the stability of fluid flow: The stainless steel concentric reducer has little interference with the fluid flow pattern during the diameter reduction process and can ensure the stability of the fluid flow.

4. Selection of eccentric reducers and concentric reducers in practical applications

In actual applications, appropriate reducers should be selected according to the specific conditions and needs of pipeline connections. If you need to connect horizontal pipes and change the pipe diameter, choose stainless steel eccentric reducers; if you need to connect gas or vertical liquid pipes and change the diameter, choose stainless steel concentric reducers.